CN102890311A - Polarization maintaining fiber pumped coupler and manufacturing method thereof - Google Patents
Polarization maintaining fiber pumped coupler and manufacturing method thereof Download PDFInfo
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- CN102890311A CN102890311A CN2011104577705A CN201110457770A CN102890311A CN 102890311 A CN102890311 A CN 102890311A CN 2011104577705 A CN2011104577705 A CN 2011104577705A CN 201110457770 A CN201110457770 A CN 201110457770A CN 102890311 A CN102890311 A CN 102890311A
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Abstract
The invention discloses a polarization maintaining fiber pumped coupler and a manufacturing method thereof. The coupler comprises a polarization maintaining main fiber and a pumped fiber bundle containing a plurality of pumped fibers, wherein one end of the pumped fiber bundle is a hollow part formed by a cladding of a tapering end; one end of the polarization maintaining main fiber is a transition zone which exposes an inner cladding and is inserted into the hollow part; the transition zone is provided with a complete stress structure; and the outer surface of the transition zone is in close contact with and integrally fused with the inner surface of the hollow part of the tapering end. The manufacturing method comprises the following steps of: preprocessing a plurality of pumped fibers to form the hollow fiber bundle, and cutting in the middle; reducing or not reducing the diameter of the inner cladding of the polarization maintaining main fiber on the premise of not damaging a fire core and the stress structure; inserting the preprocessed main fiber into the hollow pumped fiber bundle to ensure that the main fiber is in close fit with the fiber bundle; and integrally fusing the main fiber with the fiber bundle, and recoating the main fiber. The fire core and the stress structure of the polarization maintaining main fiber are not damaged during coupling, and signal coupling efficiency and polarization extinction ratio are improved.
Description
Technical field
The present invention relates to the laser technique field, relate in particular to a kind of polarization maintaining optical fibre pumping coupler and manufacture method thereof.
Background technology
Single polarization state output high-power high-energy fiber laser and amplifier has wide practical use in many fields such as optical fibre gyro, Fibre Optical Sensor, additive mixing, coherent beam combination.Therefore study the fiber laser tool with single polarization output characteristics and certain extinction ratio and be of great significance, single polarization optical fiber laser has become one of present study hotspot.Yet the main method that obtains now the single polarization fiber Laser output is to adopt discrete optical element to realize the pump light coupling.This is so that the fiber laser system less stable.Fiber laser for all optical fibre structure single polarization fiber Laser output, the polarization maintaining optical fibre pumping coupler is its core devices, existing polarization maintaining optical fibre pumping coupler in the prior art is owing to adopting the end pumping mode, and protect inclined to one side main fiber in the coupling mechanism manufacturing process and block first rear and output optical fibre welding, therefore the flashlight coupling efficiency of this polarization maintaining optical fibre pumping coupler is 90% only, and polarization extinction ratio is about 20dB.
Summary of the invention
The technical matters that (one) will solve
The technical problem to be solved in the present invention is: a kind of polarization maintaining optical fibre pumping coupler and manufacture method thereof are provided, to be coupled, improve the coupling efficiency of signal under the prerequisite of the fibre core that does not destroy polarization maintaining optical fibre and stress structure.
(2) technical scheme
For addressing the above problem, the invention provides on the one hand a kind of polarization maintaining optical fibre pumping coupler, comprise the pumping optical fiber bundle of protecting inclined to one side main fiber and containing some pumping optical fibers, one end of described pumping optical fiber bundle is that described some pumping optical fibers enclose the hollow optical fiber bundle that forms, inclined to one side main fiber one end of described guarantor is provided with the transition zone of exposing inner cladding, described transition zone has complete stress structure and inserts the hollow space of described pumping optical fiber bundle, the part that described pumping optical fiber is corresponding with the transition zone of the inclined to one side main fiber of described guarantor is to expose the cone end of drawing of covering, and described pumping optical fiber draws the inner cladding close contact of the covering of cone end and the inclined to one side main fiber transition zone of described guarantor and fuses into one.
Preferably, the transition zone of the inclined to one side main fiber of described guarantor is that radial dimension is less than the cylinder of protecting inclined to one side main fiber inner cladding main body radial dimension, form step surface between transition zone and the inner cladding main body, described pumping optical fiber draws the cone end closely to be posted by on the described transition zone radially-outer surface and draws cone end end closely to be resisted against described step surface, and described pumping optical fiber draws the diameter of cone end end suitable with the semidiameter between described fiber body transition zone and the inner cladding main body.
Preferably, the transition zone of the inclined to one side main fiber of described guarantor is narrow end near end, the wide end taper type away from the end, and the hollow space that draws the cone end to form of described some pumping optical fibers has week in the taper corresponding with described transition zone.
Preferably, the inclined to one side main fiber of described guarantor is provided with new coating layered material from the end that is positioned at the intrafascicular empty part of described pumping optical fiber to the inner cladding of the rear of transition zone, described new coat is consistent with original numerical aperture of protecting inclined to one side main fiber main body inner cladding with the numerical aperture that the inner cladding of protecting inclined to one side main fiber rear forms.
Preferably, the inclined to one side main fiber of described guarantor is panda type polarization-preserving fiber, bow-tie type polarization maintaining optical fibre, oval cladding type polarization maintaining optical fibre or the oval core polarization maintaining optical fibre of double clad or many cladding structures.
On the other hand, the present invention also provides a kind of method for making of above-mentioned polarization maintaining optical fibre pumping coupler, may further comprise the steps:
S1: remove respectively the intrafascicular some pumping optical fibers of pumping optical fiber and treat the coat in welding zone, expose covering; Remove the coat of protecting inclined to one side main fiber since an end, expose inner cladding and form transition zone, it is complete that the stress structure of described transition zone keeps;
S2: the part of described pumping optical fiber being removed coat draws cone to draw the cone end to preliminary dimension formation by certain tapering; Draw in the cone process, the central optical fiber of pumping optical fiber bundle adopts tinsel to substitute; After drawing cone to finish, tinsel is extracted out, the pumping optical fiber bundle forms the hollow optical fiber bundle;
S3: described pumping optical fiber bundle is blocked from the axial centre of drawing cone to process, and the hollow space that described pumping optical fiber draws the cone end to form is processed, make and draw cone end the hollow space shape that forms and the transition zone of protecting inclined to one side main fiber complementary;
S4: an end that will expose the inclined to one side main fiber of guarantor of inner cladding inserts the hollow space of pumping optical fiber bundle, makes transition zone and the pumping optical fiber of protecting inclined to one side main fiber draw cone end formation hollow space to fit tightly;
S5: the transition zone of the inclined to one side main fiber of described guarantor and the hollow space that draws the cone end to form of described pumping optical fiber are fused into one;
S6: inner cladding is exposed outside transition zone to the inclined to one side main fiber part of the guarantor between the end, again apply and make new coat.
Preferably, described step S2 comprises that also the inner cladding of protecting inclined to one side main fiber transition zone is carried out reduced to be processed, and forms the step of required transition zone shape, does not destroy fibre core and the stress structure of protecting inclined to one side main fiber in the process that the transition zone inner cladding is processed.
Preferably, among the described step S5, by oxyhydrogen flame, CO
2Laser instrument, propane flammable gas or particulate blowtorch fuse into one the cone end that draws of the inclined to one side main fiber transition zone of described guarantor and pumping optical fiber.
Preferably, by the method for chemical corrosion or mechanical polishing, the inclined to one side main fiber inner cladding of guarantor of removing coat among the step S2 is carried out pre-service and draws the hollow space of cone end formation to process to the described pumping optical fiber among the step S3.
(3) beneficial effect
The present invention does not destroy fibre core and the stress structure of protecting inclined to one side main fiber in the process that coupling mechanism is made, adopt hollow pumping fibre bundle and output optical fibre to closely cooperate and fuse into one, guarantee pump light from pumping optical fiber to the efficient coupling of protecting inclined to one side main fiber, and make coupler structure reliable and stable.In addition, the present invention protects inclined to one side main fiber and does not destroy the Stress Profile for Polarization-Maintaining structure, guarantees that coupling mechanism has higher polarization extinction ratio; Do not destroy fibre core, guarantee that coupling mechanism has higher Signature penetrating rate.Single coupling mechanism of the present invention can realize that a plurality of pumping arms are coupled simultaneously, can realize single coupling mechanism high power coupling.
Description of drawings
Fig. 1 is the flow chart of steps according to the embodiment of the invention two method for makings;
Fig. 2 a is the structural representation of the inclined to one side main fiber of pumping optical fiber Shu Yubao after processing through the embodiment of the invention two method for making step S2;
Fig. 2 b is the schematic cross-section of protecting inclined to one side main fiber A-A place among Fig. 2 a;
Fig. 2 c is the schematic cross-section of protecting inclined to one side main fiber B-B place among Fig. 2 a;
Fig. 2 d is pumping optical fiber binding structure schematic diagram after processing through the embodiment of the invention two method for making step S3;
Fig. 2 e is the structural representation through the inclined to one side main fiber of pumping optical fiber Shu Yubao after the embodiment of the invention two method for making step S4 and the S5 processing;
Fig. 2 f is the structural representation of the inclined to one side main fiber of pumping optical fiber Shu Yubao after processing through the embodiment of the invention two method for making step S6;
Fig. 3 a is the structural representation according to the embodiment of the invention three coupling mechanisms;
Fig. 3 b is the cut-open view at C-C place among Fig. 3 a;
Fig. 3 c is the schematic cross-section at D-D place among Fig. 3 a;
Fig. 4 a is the structural representation according to the embodiment of the invention four coupling mechanisms;
Fig. 4 b is the cut-open view at E-E place among Fig. 4 a;
Fig. 4 c is the schematic cross-section at F-F place among Fig. 4 a.
Wherein, 110 pumping optical fibers; 111 coverings; 112 draw the cone end; 113 coats; 120 protect inclined to one side main fiber; 121 inner claddings; 122 transition zone; 123 coats; 124 stress structures; 125 fibre cores; 126 new coats; 130 tinsels;
210 pumping optical fibers; 211 coverings; 212 draw the cone end; 213 coats; 220 protect inclined to one side main fiber; 221 inner claddings; 222 transition zone; 223 coats; 224 stress structures; 225 fibre cores; 226 new coats; 227 step surfaces.
310 pumping optical fibers; 311 coverings; 312 draw the cone end; 313 coats; 320 protect inclined to one side main fiber; 321 inner claddings; 322 transition zone; 323 coats; 324 stress structures; 325 fibre cores; 326 new coats.
Embodiment
That the present invention is described in detail is as follows below in conjunction with drawings and Examples.
Embodiment one:
The present embodiment has been put down in writing a kind of polarization maintaining optical fibre pumping coupler, comprise the pumping optical fiber bundle of protecting inclined to one side main fiber and containing some pumping optical fibers, one end of described pumping optical fiber bundle is that described some pumping optical fibers enclose the hollow optical fiber bundle that forms, inclined to one side main fiber one end of described guarantor is provided with the transition zone of exposing inner cladding, described transition zone has complete stress structure and inserts the hollow space of described pumping optical fiber bundle, the part that described pumping optical fiber is corresponding with the transition zone of the inclined to one side main fiber of described guarantor is to expose the cone end of drawing of covering, and described pumping optical fiber draws the inner cladding close contact of the covering of cone end and the inclined to one side main fiber transition zone of described guarantor and fuses into one.
Shown in Fig. 3 b, in some embodiments of the invention, the transition zone of the inclined to one side main fiber of described guarantor is that radial dimension is less than the cylinder of protecting inclined to one side main fiber inner cladding main body radial dimension, form step surface between transition zone and the inner cladding main body, described pumping optical fiber draws the cone end closely to be posted by on the described transition zone radially-outer surface and draws cone end end closely to be resisted against described step surface, and described pumping optical fiber draws the diameter of cone end end suitable with the semidiameter between described fiber body transition zone and the inner cladding main body.
Perhaps shown in Fig. 4 b, in other embodiment of the present invention, the transition zone of the inclined to one side main fiber of described guarantor is narrow end near end, the wide end taper type away from the end, and the hollow space that draws the cone end to form of described some pumping optical fibers has week in the taper corresponding with described transition zone.
The inclined to one side main fiber of described guarantor is provided with new coating layered material from the end that is positioned at the intrafascicular empty part of described pumping optical fiber to the inner cladding of the rear of transition zone, described new coat is consistent with original numerical aperture of protecting inclined to one side main fiber main body inner cladding with the numerical aperture that the inner cladding of protecting inclined to one side main fiber rear forms.
The inclined to one side main fiber of described guarantor is panda type polarization-preserving fiber (shown in Fig. 2 b, 2c and 3c), bow-tie type polarization maintaining optical fibre (shown in Fig. 4 c), oval cladding type polarization maintaining optical fibre or the oval core polarization maintaining optical fibre of double clad or many cladding structures.
Embodiment two:
Shown in Fig. 1, Fig. 2 a-2f, the present embodiment has been put down in writing a kind of method for making of embodiment one described polarization maintaining optical fibre pumping coupler, may further comprise the steps:
S1: remove respectively the intrafascicular some pumping optical fibers 110 of pumping optical fiber and treat the coat 113 in welding zone, expose covering 111; Remove the coat 123 of protecting inclined to one side main fiber 120 since an end, expose inner cladding 121 and form transition zone 122, the stress structure 124 of described transition zone 122 keeps complete;
S2: the part of described pumping optical fiber 110 being removed coat 113 draws cone to draw cone end 112 to preliminary dimension formation by certain tapering; Draw in the cone process, the central optical fiber of pumping optical fiber bundle adopts tinsel 130 to substitute; After drawing cone to finish, tinsel 130 is extracted out, the pumping optical fiber bundle forms the hollow optical fiber bundle; In some embodiments of the invention, by the method for chemical corrosion or mechanical polishing the inner cladding 121 of protecting inclined to one side main fiber 120 transition zone 122 being carried out reduced processes, form required transition zone 122 shapes, in the process that transition zone 122 inner claddings 121 are processed, do not destroy fibre core 125 and the stress structure 124 of protecting inclined to one side main fiber 120
S3: described pumping optical fiber bundle is blocked from the axial centre of drawing cone to process, and the method by chemical corrosion or mechanical polishing processes the hollow spaces that described pumping optical fiber 110 draws cone end 112 to form, and makes and draws cone end 112 the hollow space shapes that form and transition zone 122 complementations of protecting inclined to one side main fiber 120;
S4: an end that will expose the inclined to one side main fiber 120 of guarantor of inner cladding 121 inserts the hollow space of pumping optical fiber bundle, and the transition zone 122 of protecting inclined to one side main fiber 120 and the hollow space that pumping optical fiber 110 draws cone end 112 to form are fitted tightly;
S5: by oxyhydrogen flame, CO
2Laser instrument, propane flammable gas or particulate blowtorch hold 112 hollow spaces that form to fuse into one with the cone that draws of described pumping optical fiber 110 transition zone 122 of the inclined to one side main fiber 120 of described guarantor;
S6: inner cladding 121 is exposed outside transition zone 122 to inclined to one side main fiber 120 parts of the guarantor between the end, again apply and make new coat 126.
The below describes as an example of concrete coupler structure and method for making example
Embodiment three:
Shown in Fig. 3 a-3c, the present embodiment has been put down in writing a kind of polarization maintaining optical fibre pumping coupler, an instantiation as embodiment one, the inclined to one side main fiber 220 of the guarantor of the present embodiment is protected inclined to one side main fiber for panda type, shown in Fig. 3 b, the transition zone 222 of protecting inclined to one side main fiber 220 is the cylinder of radial dimension less than the inclined to one side main fiber 220 inner claddings 221 main body radial dimensions of guarantor, form step surface 227 between transition zone 222 and inner cladding 221 main bodys, described pumping optical fiber draws cone end 212 closely to be posted by on described transition zone 221 radially-outer surfaces and draws cone end 212 ends closely to be resisted against described step surface 227, and described pumping optical fiber draws diameter and the semidiameter between described fiber body transition zone 222 and inner cladding 221 main bodys (being step surface width radially) of cone end 212 ends suitable.
The method for making of the present embodiment coupling mechanism is: the circle that a fibre core 225/ inner cladding 221 diameters is respectively 20/400um is protected inclined to one side doubly clad optical fiber as the inclined to one side main fiber 220 of the guarantor of the present embodiment, this coat 223 of protecting inclined to one side main fiber 220 is axially removed 30cm, expose inner cladding 221; Protect the stress structure shape 224 of inclined to one side main fiber 220 for circular.Fibre core/the cladding diameter of 9 pumping optical fibers 210 is respectively 200/220um, and the coat 113 of pumping optical fiber 210 is axially removed 3cm, exposes covering 211; Adopt HF that the coat place that goes of fibre core 225/ inner cladding 221 is carried out chemical corrosion, make its reduced to 200um, form transition zone 222; Adopt the oxyhydrogen flame heating and melting to draw the cone method that 9 pumping optical fiber 210 fused biconical tapers are formed and draw cone end 212, draw that the intrafascicular heart of pumping optical fiber penetrates the circular metal silk that diameter is 203um in the cone process, make every optical fiber draw the reduced of cone end 212 to 100um after drawing cone; Then, tinsel is extracted out, and blocked from the axial centre of drawing cone, form the hollow optic fibre bundle; Then, the inclined to one side main fiber 220 of the guarantor after processing is inserted the hollow optic fibre bundles, make pumping optical fiber draw the hollow inside surfaces that cone end 212 forms and the end face that draws cone end 212 respectively with outside surface and step surface 227 close contacts of transition zone 222.Heat this close contact zone with oxyhydrogen flame, the inclined to one side main fiber 220 of pumping optical fiber Shu Yubao is fused into one; Again apply the new coat 226 of formation to protecting inclined to one side main fiber 220 input ends at last, namely finish the present embodiment coupling mechanism and make.
Embodiment four:
Shown in Fig. 4 a-4c, the present embodiment has been put down in writing a kind of polarization maintaining optical fibre pumping coupler, an instantiation as embodiment one, the inclined to one side main fiber 320 of the guarantor of the present embodiment is the bow-tie type polarization maintaining optical fibre, shown in Fig. 4 b, the transition zone 322 of the inclined to one side main fiber 320 of described guarantor is narrow end near end, the wide end taper type away from the end, and the hollow spaces that draw cone end 312 to form of described some pumping optical fibers 310 have week in the taper corresponding with described transition zone 322.
The method for making of the present embodiment coupling mechanism is: one fibre core/inner cladding diameter is respectively the partially circular doubly clad optical fiber of guarantor of 25/250um as the inclined to one side main fiber 320 of the guarantor of the present embodiment, the coat 323 of the inclined to one side main fiber 320 of described guarantor is axially removed 30cm, expose inner cladding 321; The stress structure 324 of protecting inclined to one side main fiber 320 is shaped as butterfly.9 pumping optical fibers 310 are of a size of 105/125um, and its coat 313 is axially removed 3cm, expose 311 coverings; Adopt HF that the coat place that goes of protecting inclined to one side main fiber 320 is carried out chemical corrosion, make its reduced to 125um, and form the transition zone 322 of taper type; Adopt the oxyhydrogen flame heating and melting to draw the cone method that 9 pumping optical fiber 310 fused biconical tapers are formed and draw cone end 312, draw the center of pumping optical fiber bundle in the cone process to penetrate the circular metal silk that diameter is 126um, draw to make behind the cone every pumping optical fiber 310 draw the reduced of cone end 312 to 62.5um; Then, tinsel is extracted out, and blocked the pumping optical fiber bundle from the axial centre of drawing cone, form the hollow optic fibre bundle, adopt mechanical polishing to get mode and make the hollow inside surface that draws cone end 312 to surround form taper; Then, the inclined to one side main fiber 320 of the guarantor after processing is inserted the hollow optic fibre bundle, make taper type outside surface and each pumping optical fiber 310 of protecting inclined to one side main fiber 320 transition zone 322 draw cone to hold interior all close contacts of the 312 tapered hollow parts that form.Heat this close contact part with oxyhydrogen flame, the inclined to one side main fiber 320 of pumping optical fiber Shu Yubao is fused into one; Again apply the new coat 326 of formation to protecting inclined to one side main fiber 320 input ends at last, namely finish coupling mechanism and make.
The present invention does not destroy the Stress Profile for Polarization-Maintaining structure in the process that coupling mechanism is made, guarantee that coupling mechanism has higher polarization extinction ratio; Do not destroy fibre core, guarantee that coupling mechanism has higher Signature penetrating rate.And the present invention adopts hollow pumping fibre bundle and output optical fibre to closely cooperate and fuse into one, and guarantees pump light from pumping optical fiber to the efficient coupling of protecting inclined to one side main fiber, and makes coupler structure reliable and stable.
Above embodiment only is used for explanation the present invention; and be not limitation of the present invention; the those of ordinary skill in relevant technologies field; in the situation that do not break away from the spirit and scope of the present invention; can also make a variety of changes and modification; therefore all technical schemes that are equal to also belong to category of the present invention, and scope of patent protection of the present invention should be defined by the claims.
Claims (9)
1. polarization maintaining optical fibre pumping coupler, comprise the pumping optical fiber bundle of protecting inclined to one side main fiber and containing some pumping optical fibers, it is characterized in that, one end of described pumping optical fiber bundle is that described some pumping optical fibers enclose the hollow optical fiber bundle that forms, inclined to one side main fiber one end of described guarantor is provided with the transition zone of exposing inner cladding, described transition zone has complete stress structure and inserts the hollow space of described pumping optical fiber bundle, the part that described pumping optical fiber is corresponding with the transition zone of the inclined to one side main fiber of described guarantor is to expose the cone end of drawing of covering, and described pumping optical fiber draws the inner cladding close contact of the covering of cone end and the inclined to one side main fiber transition zone of described guarantor and fuses into one.
2. polarization maintaining optical fibre pumping coupler as claimed in claim 1, it is characterized in that, the transition zone of the inclined to one side main fiber of described guarantor is that radial dimension is less than the cylinder of protecting inclined to one side main fiber inner cladding main body radial dimension, form step surface between transition zone and the inner cladding main body, described pumping optical fiber draws the cone end closely to be posted by on the described transition zone radially-outer surface and draws cone end end closely to be resisted against described step surface, and described pumping optical fiber draws the diameter of cone end end suitable with the semidiameter between described fiber body transition zone and the inner cladding main body.
3. polarization maintaining optical fibre pumping coupler as claimed in claim 1, it is characterized in that, the transition zone of the inclined to one side main fiber of described guarantor is narrow end near end, the wide end taper type away from the end, and the hollow space that draws the cone end to form of described some pumping optical fibers has week in the taper corresponding with described transition zone.
4. polarization maintaining optical fibre pumping coupler as claimed in claim 1, it is characterized in that, the inclined to one side main fiber of described guarantor is provided with new coating layered material from the end that is positioned at the intrafascicular empty part of described pumping optical fiber to the inner cladding of the rear of transition zone, described new coat is consistent with original numerical aperture of protecting inclined to one side main fiber main body inner cladding with the numerical aperture that the inner cladding of protecting inclined to one side main fiber rear forms.
5. polarization maintaining optical fibre pumping coupler as claimed in claim 1 is characterized in that, the inclined to one side main fiber of described guarantor is panda type polarization-preserving fiber, bow-tie type polarization maintaining optical fibre, oval cladding type polarization maintaining optical fibre or the oval core polarization maintaining optical fibre of double clad or many cladding structures.
6. the method for making of each described polarization maintaining optical fibre pumping coupler among the claim 1-5 is characterized in that, may further comprise the steps:
S1: remove respectively the intrafascicular some pumping optical fibers of pumping optical fiber and treat the coat in welding zone, expose covering; Remove the coat of protecting inclined to one side main fiber since an end, expose inner cladding and form transition zone, it is complete that the stress structure of described transition zone keeps;
S2: the part of described pumping optical fiber being removed coat draws cone to draw the cone end to preliminary dimension formation by certain tapering; Draw in the cone process, the central optical fiber of pumping optical fiber bundle adopts tinsel to substitute; After drawing cone to finish, tinsel is extracted out, the pumping optical fiber bundle forms the hollow optical fiber bundle;
S3: described pumping optical fiber bundle is blocked from the axial centre of drawing cone to process, and the hollow space that described pumping optical fiber draws the cone end to form is processed, make and draw cone end the hollow space shape that forms and the transition zone of protecting inclined to one side main fiber complementary;
S4: an end that will expose the inclined to one side main fiber of guarantor of inner cladding inserts the hollow space of pumping optical fiber bundle, makes transition zone and the pumping optical fiber of protecting inclined to one side main fiber draw cone end formation hollow space to fit tightly;
S5: the transition zone of the inclined to one side main fiber of described guarantor and the hollow space that draws the cone end to form of described pumping optical fiber are fused into one;
S6: inner cladding is exposed outside transition zone to the inclined to one side main fiber part of the guarantor between the end, again apply and make new coat.
7. method for making as claimed in claim 6, it is characterized in that, described step S2 comprises that also the inner cladding of protecting inclined to one side main fiber transition zone is carried out reduced to be processed, form the step of required transition zone shape, in the process that the transition zone inner cladding is processed, do not destroy fibre core and the stress structure of protecting inclined to one side main fiber.
8. method for making as claimed in claim 6 is characterized in that, among the described step S5, by oxyhydrogen flame, CO
2Laser instrument, propane flammable gas or particulate blowtorch fuse into one the cone end that draws of the inclined to one side main fiber transition zone of described guarantor and pumping optical fiber.
9. method for making as claimed in claim 7, it is characterized in that, by the method for chemical corrosion or mechanical polishing, the inclined to one side main fiber inner cladding of guarantor of removing coat among the step S2 is carried out pre-service and draws the hollow space of cone end formation to process to the described pumping optical fiber among the step S3.
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|---|---|
| CN102890311B (en) | 2015-05-20 |
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